Reduce the number of imports for functools

Author: methane

Lib/collections/__init__.py

@@ -26,7 +26,6 @@
 from operator import itemgetter as _itemgetter, eq as _eq
 from keyword import iskeyword as _iskeyword
 import sys as _sys
-import heapq as _heapq
 from _weakref import proxy as _proxy
 from itertools import repeat as _repeat, chain as _chain, starmap as _starmap
 from reprlib import recursive_repr as _recursive_repr
@@ -557,7 +556,8 @@ def most_common(self, n=None):
         # Emulate Bag.sortedByCount from Smalltalk
         if n is None:
             return sorted(self.items(), key=_itemgetter(1), reverse=True)
-        return _heapq.nlargest(n, self.items(), key=_itemgetter(1))
+        import heapq
+        return heapq.nlargest(n, self.items(), key=_itemgetter(1))
 
     def elements(self):
         '''Iterator over elements repeating each as many times as its count.

Lib/functools.py

@@ -19,8 +19,6 @@
     pass
 from abc import get_cache_token
 from collections import namedtuple
-from types import MappingProxyType
-from weakref import WeakKeyDictionary
 from reprlib import recursive_repr
 from _thread import RLock
 
@@ -753,8 +751,10 @@ def singledispatch(func):
     function acts as the default implementation, and additional
     implementations can be registered using the register() attribute of the
     generic function.
-
     """
+    from types import MappingProxyType
+    from weakref import WeakKeyDictionary
+
     registry = {}
     dispatch_cache = WeakKeyDictionary()
     cache_token = None